The mob at Newsweek editor-at-large Lally Weymouth‘s annual July Fourth party was more Washington, DC, than Southampton, LI. Among the revelers were diplomat Richard Holbrooke, former US Attorney General Michael Mukasey, Sen. Chuck Schumer, George Soros, Lt. Gov. Richard Ra vitch, Al D’Amato, Peter Ka likow, Charlie Rose and liti gious real estate developer Sheldon Solow, 81, who re cently returned to his office after a six-month absence. “Solow was behaving as if it were his coming-out party,” our source said.